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Conserved Binding Sites01:49

Conserved Binding Sites

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Related Experiment Video

Updated: Sep 30, 2025

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis
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Structural Prediction of Peptide-MHC Binding Modes.

Marta A S Perez1,2,3, Michel A Cuendet3,4, Ute F Röhrig3

  • 1Computer-aided Molecular Engineering Group, Department of Oncology UNIL-CHUV, Lausanne University, Lausanne, Switzerland.

Methods in Molecular Biology (Clifton, N.J.)
|March 17, 2022
PubMed
Summary

Predicting the 3D structures of peptide/MHC complexes is crucial for understanding immune responses. This review covers pMHC structure characteristics, databases, and docking software to aid research in vaccines and immunotherapy.

Keywords:
DatabasesDocking algorithmsImmune systemLigand bindingMajor histocompatibility complexMolecular mechanicsPeptide antigenPeptide dockingT-cell receptor

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Area of Science:

  • Immunology
  • Structural Biology
  • Computational Biology

Background:

  • The CD8+ T-cell immune response relies on T-cell receptor recognition of peptide/MHC class I complexes.
  • MHC polymorphism significantly impacts vaccine design, autoimmune disease treatment, and cancer immunotherapy.
  • Current methods predict peptide binders and immunogenicity, but structural understanding of peptide/MHC binding is limited.

Purpose of the Study:

  • To review the structural characteristics of peptide/MHC (pMHC) complexes.
  • To provide an overview of available databases and information sources for pMHC structures and MHC specificities.
  • To discuss prominent pMHC docking software for structure prediction.

Main Methods:

  • Literature review of pMHC complex structural characteristics.
  • Compilation of databases and resources for pMHC structures and MHC specificities.
  • Survey of existing pMHC docking software.

Main Results:

  • The 3D structure of pMHC complexes is key to understanding molecular mechanisms of immune responses.
  • Existing databases offer valuable information but cover only a fraction of possible pMHC combinations.
  • Various pMHC docking software tools are available, aiding in structure prediction.

Conclusions:

  • Accurate prediction of pMHC structures is essential due to the vast diversity of MHC allotypes and peptides.
  • Knowledge of pMHC structure, databases, and docking software facilitates advancements in immunology and related therapies.
  • Further development of efficient pMHC structure prediction methods is needed.